Improvement in grates for furnaces



PATENT OFFICE lHENRY RYDER, OF SOMERVILLE, MASSACHUSETTS.

IMPROVEMENTYIN GRATES FOR FURNACES.

Specification forming part of Letters Patent No. l36,673, dated March 1l, 1813.

To all whom 'it may concern:

Be it known that I, HENRY RYDER, of Somerville, of the county of Middlesex and State of Massachusetts, have invented a new and useful Improvement in Furnaces or the Grates thereof; and do hereby declare the same to be fully described in the following specification and represented in the accompanying drawing, of which- Figure l is a top view, Fig. 2 a longitudinal section, and Fig. 3 a transverse section, of a furnace containing my invention. Fig. 4' is a top view of the furnace and grate-bars without the inclined guards. Fig. 5 is a top view of one of the said guards.

My invention consists in the combination of a series of stationary grate-bars, a series of movable grate-bars, a fire-place, inclined guards, and a mechanism for operating the movable bars, all being substantially as here inafter explained, and as shown in the drawing.

VIn such drawing. A denotes a common furnace or steam boiler lire place having its grate composed of a series, a a a, of stationary bars, and a series, b b b, of movable and shorter bars, all arranged horizontally and in manner with respect to each other and an ashpit, P, as shown, the movable l bars being notched in their upper surfaces. Each of the longer bars, however, is not quite so long as the distance between the end walls of the furnace, the same being so as to allow of the Vproper expansion of the bar lengthwise under the heat to which it may be subjected. Bars of other furnaces havek been so made, but at their ends they have been left uncovered, When this has been the case cinders, coal, or ashes have usually become packed or have gathered between the ends of the bars and the next adjacent walls, and acted to prevent the bars from expanding, causing them, under the operation of the heat tending to expand them, to become curved, sprung out of shape, or broken. Such derangement or breakage of a grate-bar will be prevented by the nclined guard-plates B B, which rest on the several grate-bars and against shoulders or abutments c c c projecting up from some of them, and also against the ends d d of the furnace A. The plates B B, being inclined with respect to the grate-bars in manner as represented, and simply resting against the ends of the furnace, move with the gratebars as they may expand or contract lengthwise. The plates thus cover the spaces next the ends of the bars and prevent them from becoming choked by the ashes, cinders, or fuel, thereby enabling the grate-bars to expand without danger of being estopped, so as to be bent or broken by the force operating to expand them. The shorter bars b are free to move lengthwise on their supportingshelves l Z, each of said barsbeing notched at its middle, as shown at e, to receive one.

of a series of arms, f, projecting upward from a rocker-shaft, g, arranged across the ash-pit P and going through one side wall of the furnace, and provided with a lever or arm, D, all as shown. By taking hold of the arm D and working it up and down, reciprocating rectilinear motions will be imparted to the movable grate-bars b, whereby the ashes will be caused to fall from the grate and between its bars and into the ash-pit.

The movable bars are raised or extend a little above the stationary ones so as to be sure to eli'ect a proper distribution of the coal or fuel.

I claim asv my invention- The combination of the series of stationary grate-bars'af, the series of movable grate-bars b, the fire-place A, the inclined guards B, and the mechanism for operating the movable bars, all being constructed and arranged substantially in manner as explained and represented.

. HENRY RYDER.

Witnesses:

- R. H. Enma, J. E. SNow. 

